Liquid dispensing nozzle



Mal'dl 1943- H. M. GROOMES LIQUID DISPENSING NOZZLE Filed Oct. 21 1940 hg l H.

'Snnentor Patented Mar. 9, 1943 UNITED STATES PTENT OFFICE 2,313,539 LIQUID DISPENSING NOZZLE Harry M. Groomes, Whitmore Lake, Mich.

Application October 21, 1940, Serial No. 362,015

Claims.

This invention relates to nozzles and in particular to liquid dispensing nozzles such as are employed for the dispensing of gasoline or other liquids.

One object of this invention is to provide a liquid dispensing nozzle having the valve mechanism contained wholly within the nozzle.

Another object is to provide a liquid dispensing nozzle having a valve stem which is reciprocable along an axis extending parallel to the axis of the nozzle chamber, thereby eliminating projections or bull nuts from the eXteriorof the nozzle casing and imparting a streamline appearance to the nozzle.

Another object is to provide a liquid dispensing nozzle having a valve reciprocable longitudinally within the nozzle casing, both ends of the valve stem terminating within the nozzle casing and being free from packings, thereby substantially eliminating friction otherwise interfering with the reciprocation of the valve stem.

Another object is to provide a liquid dispensing nozzle having a valve reciprocable longitudinally within the nozzle casing and with cam mechanism operable from the control handle for reciprocating the valve stem.

Another object is to provide a liquid dispensing nozzle having a valve port substantially in line with the inlet and outlet chambers of the nozzle and a reciprocable valve stem reciprocated by cam mechanism to move a valve thereon into and out of closing engagement with this valve port.

Another object is to provide a liquid dispensing nozzle as set forth in the preceding objects wherein the cam mechanism consists of a cam mounted on a cam shaft extending into the nozzle casing and connected to a control handle outside the nozzle casing. I

Another object is to provide a liquid dispensing nozzle composed of easily manufactured parts and adapted to be assembled and disassembled with speed and facility.

In the drawing:

Figure 1 is a central longitudinal section through a preferred embodiment of the liquid dispensing nozzle of this invention.

Figure 2 is a cross section substantially along the irregular line 2-2 in Figure 1.

Figure 3 is a left-hand side elevation of Figure 2.

Figure 4 is a cross section along the line 4-4 in Figure 1.

Hitherto, liquid dispensing nozzles, such as are used for dispensing gasoline from filling stations to automobile gasoline tanks, have been unsatisfactory clue to the inability of the operator to accurately control the discharge of the liquid. In particular, such nozzles have been provided with a double pivot mechanism and with valve stems extending through packings in the nozzle easing into engagement with such mechanism. The friction arising between the packing and the valve stem has required the use of a heavy spring for forcing the valve into engagement with its seat. Despite this spring, however, the friction frequently causes binding of the valve stem so that the valve does not close immediately as the control handle is released, but lags behind and then closes with a rush. This results in a so-called pressure kick which prevents the operator from accurately tapering off the flow of the liquid as the tank becomes full.

Such prior art nozzles have also been characterized by bull nuts mounted thereon for projecting from the casing. These bull nuts are unsightly, easily damaged, and interfere with the proper use of the nozzle. Such nozzles also frequently required liquid to follow a circuitous path through the inlet chamber, the valve chamber, and the outlet chamber, thus giving rise to eddy currents and other actions interfering with the free flowof the liquid.

In the nozzle of the present invention, however, the valve stem terminates within the nozzle casing, hence is entirely free from any packings and is consequently free from packing friction. The valve stem therefore requires only a very light spring pressure to return the valve to its seat, and there is no binding or pressure kick resulting from such packing friction. Moreover, the valve stem is reciprocated by cam mechanism directly connected to the control handle and directly actuated thereby without lost motion or double pivot connections. The valve stem is also supported by guide bores on opposite sides of the valve seat, thereby still further enhancing the free reciprocation of the valve.

The cam mechanism for actuating the valve stem is mounted on a rotary shaft which merely requires a small packing at the point where it emerges from the nozzle casing. Since this cam shaft rotates rather than reciprocates, however, the packing merely creates rotational friction, which is very small in comparison with the sliding or reciprocating friction set up against the valve stems of previous nozzles by the packings surrounding the valve stems where they emerge from the nozzle casings. The valve port of the present nozzle is substantially in line with the inlet and outlet chambers of the nozzle, hence there is substantially a straight line flow of liquid through the nozzle.

Referring to the drawing in detail, the liquid dispensing nozzle of this invention in its preferred embodiment consists of a nozzle casing l having an inlet chamber l I, a valve chamber l2 communicating therewith, an outlet chamber I3, and a nozzle extension l4 threaded into the latter as at [5. The valve chamber [2 is co-extensive with the inlet chamber H and is provided with a partition [6 having a threaded bore ll adapted to receive a valve seat member [8 containing a conical valve seat I 9. The valve seat member 18 is also provided with a bridge portion 20 (Figure 4) having a guide bore 2| for a reciprocable valve stem 22, the opposite end of which engages a guide bore 23 in an internal boss 24 forming a part of the nozzle casing Ill. The valve stem 22 is provided with an enlargement 25 receiving a washer 26 against which a valve head 21 is held by means of a washer 28 and nut 29 mounted upon the threaded portion 30 of the valve stem 22. A coil spring 3| extends between the boss 24 and the washer 28 and urges the valve head 21 into engagement with the valve seat IS.

The lower end of the valve stem 22 is rounded as at 32 and engages the cam member 33 havin a stem 34 mounted in the transverse bore 35 of the cam shaft 36 by means of the pin 31 (Figure 2) slidably mounted through the bores 38 and 39 in the cam shaft 36 and stem 34 respectively. The head of the pin 31 is urged against the end wall of the cam shaft bore 45 by the coil spring 4!, the outer end of which abuts the inner wall of the hollow cap 42 threaded into the threaded bore 43 of the nozzle casing H3. The pin 31 is provided with an extension 44 by which it may be grasped in order to insert or remove it. This separable construction of the cam member 33 and cam shaft 36 enables the parts thereof to be simplified as regards their manufacture.

The opposite end of the cam shaft 36 from the bore 46 is provided with a stem 45 extending through a bore 46 in the nozzle casing l0 and having an arm 47 with a socket 48 engaging the outer end of the stem 45. A pin 49 secures the arm 41 to the stem 45. A packing 56 is interposed between the end of the cam shaft 36 adjacent the beginning of the stem 45 and the inner wall of the nozzle casing [0, the coil spring 4| serving to urge the cam shaft 36 to the left (Figure 2) to compress the packing 50 and prevent leakage. The packing 56 merely exerts a rotary friction upon the rotatable cam shaft 36, however, and hence the drag of this is negligible as compared with the drag of an external packing upon a reciprocable valve stem passing through the outer wall of the nozzle casing, as in the prior art;

The arm 41 is slotted as at to receive an arm 52 forming a portion of the control handle shaft 53 and connected thereto by the pin 54 extending through the bore 55 in the arm 41. An elongated slot 56 in the outer end of the arm 52 compensates for the changing distance of the pin 54 from the axis of the handle shaft 53 as the latter rotates and swings the arm 41. The packing 56 is seated by annular cutting ridges maintained at a constant pressure by the spring 4 l.

Mounted upon the inner end of the handle shaft 53 and secured thereto by the pin 54 is an operating handle or control member 55. The shaft 53 is rotatably supported in a bore 56 passing through the ears 5! extending outwardly from the nozzle casing H]. The operating handle or control member 55 is protected by a guard 58 secured at its opposite ends to the bosses 59 and 60 of the nozzle casing 10 by the rivets El and 62 (Figure 1). The arm 41 is also protected by an arcuate guard 63 (Figure 3) extending partially around the hub of the arm 41 and having a space between its extremities sufficiently large for the swinging of the arm 41.

While a specific embodiment of the invention has been described and illustrated, it will be understood that various modifications may be made within the scope of the appended claims without departing from the spirit of the invention.

What I claim is:

1. In a liquid dispensing nozzle, a nozzle casing having an elongated chamber with a valve port therein, a valve stem movable longitudinally of said chamber and having a valve head movable into and out of engagement with said valve port, a control member shaft, a control member mounted on said shaft outside said nozzle casing chamber, an arm on said shaft, a second shaft extending into said nozzle casing chamber, an arm on said second shaft having a pin and slot connection with the first shaft, and means connected to said second shaft for moving said valve stem in response to the motion of said control member.

2. In a liquid dispensing nozzle, a nozzle casing having an elongated chamber with a valve port therein, a valve stem movable longitudinally of said chamber and having a valve head movable into and out of engagement with said valve port, a control member outside said nozzle casing chamber, a shaft connected thereto and extending into said casing chamber, a cam member inserted in a bore in said shaft and engaging said valve stem, detachable means for securing said cam member in said bore, and yielding means urging said detachable means into its securing position.

3. In a liquid dispensing nozzle, a nozzle casing having an elongated chamber and a valve port therein, a removable valve seat mounted in said valve port, a valve stem completely housed within and movable longitudinally with respect to said chamber, and having a valve head movable into and out of engagement with said valve port, a valve guide bore formed integral with one wall of said casing on one side of said valve port, a valve guide on the opposite side of said port formed integral with the valve seat, said guides having aligned bores to receive and guide said valve stem in its motion and means for moving said valve stem.

4. In a liquid dispensing nozzle, a nozzle casing having an elongated valve chamber with a valve port therein, a valve seat mounted in said port, a valve stem movable longitudinally of said chamber and completely housed therein, a valve a valve stem guided by the guide means completely housed Within and movable longitudinally relative to said chamber, one of said guide means being formed as an integral part of the nozzle casing and the other guide means being formed integral with the valve seat, and means for moving said valve stem.

HARRY M. GROOMES. 

